Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 162 insertions, 0 deletions

diff --git a/sound/soc/sof/sof-client-ipc-kernel-injector.c b/sound/soc/sof/sof-client-ipc-kernel-injector.c
new file mode 100644
index 0000000000..ad0ed2d570
--- /dev/null
+++ b/sound/soc/sof/sof-client-ipc-kernel-injector.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2023 Google Inc. All rights reserved.
+//
+// Author: Curtis Malainey <cujomalainey@chromium.org>
+//
+
+#include <linux/auxiliary_bus.h>
+#include <linux/debugfs.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <sound/sof/header.h>
+
+#include "sof-client.h"
+
+#define SOF_IPC_CLIENT_SUSPEND_DELAY_MS	3000
+
+struct sof_msg_inject_priv {
+	struct dentry *kernel_dfs_file;
+	size_t max_msg_size;
+
+	void *kernel_buffer;
+};
+
+static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file)
+{
+	int ret = debugfs_file_get(file->f_path.dentry);
+
+	if (unlikely(ret))
+		return ret;
+
+	ret = simple_open(inode, file);
+	if (ret)
+		debugfs_file_put(file->f_path.dentry);
+
+	return ret;
+}
+
+static ssize_t sof_kernel_msg_inject_dfs_write(struct file *file, const char __user *buffer,
+					       size_t count, loff_t *ppos)
+{
+	struct sof_client_dev *cdev = file->private_data;
+	struct sof_msg_inject_priv *priv = cdev->data;
+	struct sof_ipc_cmd_hdr *hdr = priv->kernel_buffer;
+	struct device *dev = &cdev->auxdev.dev;
+	ssize_t size;
+	int ret;
+
+	if (*ppos)
+		return 0;
+
+	size = simple_write_to_buffer(priv->kernel_buffer, priv->max_msg_size,
+				      ppos, buffer, count);
+	if (size < 0)
+		return size;
+	if (size != count)
+		return -EFAULT;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0 && ret != -EACCES) {
+		dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
+		return ret;
+	}
+
+	sof_client_ipc_rx_message(cdev, hdr, priv->kernel_buffer);
+
+	pm_runtime_mark_last_busy(dev);
+	ret = pm_runtime_put_autosuspend(dev);
+	if (ret < 0)
+		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", ret);
+
+	return count;
+};
+
+static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)
+{
+	debugfs_file_put(file->f_path.dentry);
+
+	return 0;
+}
+
+static const struct file_operations sof_kernel_msg_inject_fops = {
+	.open = sof_msg_inject_dfs_open,
+	.write = sof_kernel_msg_inject_dfs_write,
+	.release = sof_msg_inject_dfs_release,
+
+	.owner = THIS_MODULE,
+};
+
+static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
+				const struct auxiliary_device_id *id)
+{
+	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
+	struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);
+	struct device *dev = &auxdev->dev;
+	struct sof_msg_inject_priv *priv;
+	size_t alloc_size;
+
+	/* allocate memory for client data */
+	priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev);
+	alloc_size = priv->max_msg_size;
+	priv->kernel_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL);
+
+	if (!priv->kernel_buffer)
+		return -ENOMEM;
+
+	cdev->data = priv;
+
+	priv->kernel_dfs_file = debugfs_create_file("kernel_ipc_msg_inject", 0644,
+						    debugfs_root, cdev,
+						    &sof_kernel_msg_inject_fops);
+
+	/* enable runtime PM */
+	pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+}
+
+static void sof_msg_inject_remove(struct auxiliary_device *auxdev)
+{
+	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
+	struct sof_msg_inject_priv *priv = cdev->data;
+
+	pm_runtime_disable(&auxdev->dev);
+
+	debugfs_remove(priv->kernel_dfs_file);
+}
+
+static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {
+	{ .name = "snd_sof.kernel_injector" },
+	{},
+};
+MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table);
+
+/*
+ * No need for driver pm_ops as the generic pm callbacks in the auxiliary bus
+ * type are enough to ensure that the parent SOF device resumes to bring the DSP
+ * back to D0.
+ * Driver name will be set based on KBUILD_MODNAME.
+ */
+static struct auxiliary_driver sof_msg_inject_client_drv = {
+	.probe = sof_msg_inject_probe,
+	.remove = sof_msg_inject_remove,
+
+	.id_table = sof_msg_inject_client_id_table,
+};
+
+module_auxiliary_driver(sof_msg_inject_client_drv);
+
+MODULE_DESCRIPTION("SOF IPC Kernel Injector Client Driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);